標準號：DIN EN ISO 17201-4-2006
中文標準名稱：聲學.射程內噪聲.第4部分:發射噪音預報(ISO 17201-4:2006)
英文標準名稱：Acoustics - Noise from shooting ranges - Part 4: Prediction of projectile sound (ISO 17201-4:2006); English version of DIN EN ISO 17201-4:2006-07
標準類型：Z32;Y55
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：Z32;Y55
國際標準分類號：17.140.20;95.020;97.220.10
引用標準：ISO 9613-2;ISO 17201-1
適用范圍：Shooting sound consists in general of three components: muzzle sound, impact sound, and projectile sound. This standard solely deals with projectile sound which only occurs if the projectile moves with supersonic speed. This standard specifies a method to calculate the source sound exposure level of projectile sound. Also this standard gives guidelines for calculating the propagation of projectile sound as far as it deviates from the propagation of other sound sources. The projectile sound is obtained by a calculation method instead of a measurement method, because a measurement method would be very complicated due to the non-linear behaviour of the sound propagation close to the projectile trajectory and due to the large number of parameters that determine the sound exposure level of projectile sound. Projectile sound is described as originating from a certain point on the projectile trajectory, the source point. The source level is calculated from the geometric properties and the speed of the projectile along the trajectory. As a result of non-linear effects, the frequency content of the projectile sound exposure depends on the distance from the source point. This is taken into account. Guidance is given how the sound exposure level can be calculated from the source level, geometrical attenuation, attenuation due to the non- linear effects, atmospheric absorption, and the excess attenuation due to ground reflections and atmospheric refraction. Also the effects on the sound exposure level of the decrease of the projectile speed and of atmospheric turbulence are taken into account.#,,#